diff --git a/ChangeLog b/ChangeLog
index 620b160815..ef58936c76 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Oct  4 15:46:32 2006  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* parse.y (block_param): should interpret single parenthesized
+	  left hand side expression.
+
 Wed Oct  4 08:52:30 2006  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* test/optparse/test_getopts.rb: changed the class name of test case
diff --git a/parse.y b/parse.y
index b3338f97a9..6d7e7c901c 100644
--- a/parse.y
+++ b/parse.y
@@ -2861,7 +2861,7 @@ block_param1	: bv_decl
 		| tLPAREN block_param rparen
 		    {
 		    /*%%%*/
-			$$ = $2;
+			$$ = NEW_MASGN(NEW_LIST($2), 0);
 		    /*%
 			$$ = dispatch1(mlhs_paren, $2);
 		    %*/